I have faced a warning during testing your patches.
The testcase is simple:
# ssh to the node
mount -t container none /cnt/rss/ -o rss
mkdir /cnt/rss/0
/bin/echo $$ > /cnt/rss/0/tasks
# exit with ^d and ssh again
rmdir /cnt/rss/0
dmesg
The bug seems to be here:
static int container_tasks_open(struct inode *unused, struct file *file)
{
...
npids = container_task_count(cont);
pidarray = kmalloc(npids * sizeof(pid_t), GFP_KERNEL);
if (!pidarray)
goto err1;
...
}
The npids happened to be 0 and kmalloc warns that size is zero.
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